don't use LV2 idle_wrapper with suil-1.4.1

segfault when closing the window (in A3):

Program received signal SIGSEGV, Segmentation fault.
in suil_x11_wrapper_idle () from .../lib/suil-0/libsuil_x11_in_gtk2.so
fix reverb initialization.

Due to non-zeroed re-allocation of the reverb-buffers
there may have been clicks, strange-noise or even
just silence all the time (huge float values).